Nested Virtualization Performance Gap - Current 2019

asked 2019-08-08 06:44:54 -0600

arnoldoree gravatar image

Hi. I can see the benefit and potential of running a production OpenStack cloud in a fully virtualized environment (i.e. through nested virtualization). I would be willing to give up a degree of performance for this.

Does anyone know roughly what the performance cost is for deploying OpenStack as (L2) nested VM nodes, as opposed to (L1) VM nodes, and as opposed to (L0) bare metal host services; where the guest hypervisor has full access to the bare metal host's hardware-assisted virtualization extensions (host-model - exact match)?

Given that as of Feb 2018 the nested virtualization feature of KVM became considered working but experimental (link: (, does this materially narrow the performance gap? [Info: Bare metal host & guest hypervisor: Debian Buster > current - August 2019: QEMU/KVM].

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